At first sight it is a carpenter’s flared slick chisel as it is the right shape; in plan view anyway. Only time I used one a lot was in the early 90s when me and my old partner built a large log cabin in New Zealand. Slicks are used for paring with the grain on irregular shaped timber; for example, to ease or square the end of the log or to remove irregularities etc.
It is a bit hard to tell without a side elevation view but it looks like that tool is possibly too thin to be a slick. If the blade is thin then my guess is that it is some form of scraper. Lots of ship scrapers are that shape too. If the blade is a bit beefy and it is was once honed like a chisel on one side it might be a slick.
NB. that log cabin was one on the timber building’s I have built that I was most proud of; it was definitely one of the most interesting. Last time I went back to NZ to visit family I discovered that the guy I built it for had died and his kids had parcelled up his farm and sold the land for housing. The cabin was gone. I imagine it got sold dismantled and reassembled somewhere else. I really hope so anyway.